28905743 has 4 divisors (see below), whose sum is σ = 29337240. Its totient is φ = 28474248.

The previous prime is 28905731. The next prime is 28905757. The reversal of 28905743 is 34750982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28905743 - 2⁴ = 28905727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28905697 and 28905706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28905713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215648 + ... + 215781.

It is an arithmetic number, because the mean of its divisors is an integer number (7334310).

Almost surely, 2^28905743 is an apocalyptic number.

28905743 is a deficient number, since it is larger than the sum of its proper divisors (431497).

28905743 is an equidigital number, since it uses as much as digits as its factorization.

28905743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431496.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 28905743 is about 5376.4061416526. The cubic root of 28905743 is about 306.8984622493.

The spelling of 28905743 in words is "twenty-eight million, nine hundred five thousand, seven hundred forty-three".